Just make sure you follow the directions on the can EXACTLY. You have to remove the animal and the water bowl. Neither can be anywhere near the PAM, let it dry, then replace animal and water bowl.
You can spray anything else-
cage
cage furniture
hides
substrate
etc
PAM does warn you, if you have any insects (spiders, crickets, etc) it will kill them for x amount of days (i cant remember exactly how many) so if you keep any of those, or have any insect eaters, be careful with those.
good luck!
I had one snake with a REALLY bad case of mites, one treatment with PAM eradicated them completely and within seconds I saw the mites dieing off.